Issue with opening Solidworks files from Solidworks explorer

Hello

I have two CAD machines that have both SW 2016 and SW Explorer 2016.

1st Machine:

If I have SW open and go to SW explorer and click on a file to open, the part opens up in SW without creating a new session.

2nd Machine:

If I have SW open and go to SW explorer and click on a file to open, the part WILL NOT open in SW period.

If I do not have SW open and go to SW explorer and click on a file to open, the part opens up in SW in a new session.

How do I get the second machine to function like the first machine?

Notes:

1) Our subscription is up to date.

2) In both cases, when I have SW open, I do not have any files open in SW before going into SW explorer.

3) We are using Workgroup PDM.

SolidworksSolidworks Explorer